What is an ExhaustMeister?ExhaustMeister™ is a complete plug-n-play controller designed for the BMW (Series 1,3,5,6,7,M5, M6, X) that allows you to remotely open and close the vacuum operated exhaust silencer valve (Active Noise Cancellation) that is located just past the muffler any time you like with NO ENGINE CODES AND NO DRONE! BMW uses this valve to control sound when optimum performance is not needed. When the silencer valve is closed, the exhaust is in quite mode. When fully opened, the exhaust system is in maximum flow mode and therefore is louder as a result. Many BMW owners want a more performance oriented sound from their exhaust without being annoying. After the 10 minute installation, ExhaustMeister™ allows the owner to open & close the valve at will with the supplied remote control or via the native BMW garage door controls!Works with stock and aftermarket exhaust that retain the factory vacuum actuated silencer valve(s)!! See the customer testimonials…